Large-scale international validation of the ADO index in subjects with COPD: an individual subject data analysis of 10 cohorts
Milo A Puhan, Nadia N Hansel, Patricia Sobradillo, Paul Enright, Peter Lange, DeMarc Hickson, Ana M Menezes, Gerben ter Riet, Ulrike Held, Antonia Domingo-Salvany, Zab Mosenifar, Josep M Antó, Karel G M Moons, Alphons Kessels, Judith Garcia-Aymerich, for the International COPD Cohorts Collaboration Working Group
BMJ Open Jan 2012, 2 (6) e002152; DOI: 10.1136/bmjopen-2012-002152